oj.uz

Submission #919769

# Submission time Handle Problem Language Result Execution time Memory
919769 2024-02-01T15:44:12 Z Flan312 Mecho (IOI09_mecho) C++17
100 / 100
 161 ms 4372 KB 
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define eb emplace_back
#define task ""
#define fast ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define nx freopen (task".inp","r",stdin), freopen (task".out","w",stdout);
#define fi first
#define se second
#define pii pair <int, int>
#define tii tuple <int, int, int, int>
using namespace std;
const int nmax = 802;
const int mvx[] = {1, -1, 0, 0};
const int mvy[] = {0, 0, 1, -1};
int n, s;
char a[nmax][nmax];
pii Start;
int reach_time[nmax][nmax];
void Bee_timetable()
{
    queue <pii> q;
    for (int i = 1; i <= n; ++i)
        for (int j = 1; j <= n; ++j)
            if (a[i][j] == 'H')
            {
                reach_time[i][j] = 0;
                q.emplace(i, j);
            }
    while(q.size())
    {
        auto [u, v] = q.front();
        q.pop();
        for (int k = 0; k < 4; ++k)
        {
            int x = u + mvx[k];
            int y = v + mvy[k];
            if (x < 1 || x > n) continue;
            if (y < 1 || y > n) continue;
            if (a[x][y] == 'D' || a[x][y] == 'T') continue;
            if (reach_time[x][y] != 1e9) continue;
            reach_time[x][y] = reach_time[u][v] + 1;
            q.emplace(x, y);
        }
    }
}
bool check(int mid)
{
    queue <tii> q;
    q.emplace(Start.fi, Start.se, mid, s);
    vector <vector<bool> > vs(n + 2, vector <bool> (n + 2, 0));
    while(q.size())
    {
        auto [u, v, time, rem_step] = q.front();
        q.pop();
        if (a[u][v] == 'D') return 1;
        if (!rem_step) rem_step = s, ++time;
        if (reach_time[u][v] <= time) continue;
        for (int k = 0; k < 4; ++k)
        {
            int x = u + mvx[k];
            int y = v + mvy[k];
            if (x < 1 || x > n) continue;
            if (y < 1 || y > n) continue;
            if (vs[x][y]) continue;
            if (a[x][y] == 'T') continue;
            vs[x][y] = 1;
            q.emplace(x, y, time, rem_step - 1);
        }
    }
    return 0;
}
int main()
{
    if (ifstream(task".inp")) nx
    fast
    cin >> n >> s;
    for (int i = 1; i <= n; ++i)
        for (int j = 1; j <= n; ++j)
        {
            cin >> a[i][j];
            reach_time[i][j] = 1e9;
            if (a[i][j] == 'M') Start = {i, j};
        }
    Bee_timetable();
    int l = 0, r = n * n, ans = -1;
    while(l <= r)
    {
        int mid = l + r >> 1;
        if (check(mid)) ans = mid, l = mid + 1;
        else r = mid - 1;
    }
    cout << ans;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:89:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   89 |         int mid = l + r >> 1;
      |                   ~~^~~
mecho.cpp:7:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 | #define nx freopen (task".inp","r",stdin), freopen (task".out","w",stdout);
      |            ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
mecho.cpp:75:31: note: in expansion of macro 'nx'
   75 |     if (ifstream(task".inp")) nx
      |                               ^~
mecho.cpp:7:52: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 | #define nx freopen (task".inp","r",stdin), freopen (task".out","w",stdout);
      |                                            ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
mecho.cpp:75:31: note: in expansion of macro 'nx'
   75 |     if (ifstream(task".inp")) nx
      |                               ^~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 516 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 600 KB Output is correct
7 Correct 68 ms 4224 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 2652 KB Output is correct
13 Correct 1 ms 604 KB Output is correct
14 Correct 2 ms 2648 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 344 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 344 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 1 ms 600 KB Output is correct
22 Correct 1 ms 604 KB Output is correct
23 Correct 1 ms 604 KB Output is correct
24 Correct 1 ms 604 KB Output is correct
25 Correct 1 ms 2648 KB Output is correct
26 Correct 1 ms 2648 KB Output is correct
27 Correct 2 ms 2648 KB Output is correct
28 Correct 1 ms 2648 KB Output is correct
29 Correct 1 ms 2652 KB Output is correct
30 Correct 1 ms 2648 KB Output is correct
31 Correct 1 ms 2652 KB Output is correct
32 Correct 1 ms 2648 KB Output is correct
33 Correct 7 ms 2908 KB Output is correct
34 Correct 6 ms 3064 KB Output is correct
35 Correct 19 ms 2904 KB Output is correct
36 Correct 5 ms 3164 KB Output is correct
37 Correct 4 ms 3164 KB Output is correct
38 Correct 20 ms 3160 KB Output is correct
39 Correct 9 ms 3160 KB Output is correct
40 Correct 6 ms 3164 KB Output is correct
41 Correct 38 ms 3300 KB Output is correct
42 Correct 7 ms 3160 KB Output is correct
43 Correct 7 ms 3160 KB Output is correct
44 Correct 34 ms 3164 KB Output is correct
45 Correct 13 ms 3416 KB Output is correct
46 Correct 9 ms 3256 KB Output is correct
47 Correct 43 ms 3420 KB Output is correct
48 Correct 8 ms 3420 KB Output is correct
49 Correct 14 ms 3420 KB Output is correct
50 Correct 57 ms 3588 KB Output is correct
51 Correct 10 ms 3672 KB Output is correct
52 Correct 10 ms 3492 KB Output is correct
53 Correct 66 ms 3696 KB Output is correct
54 Correct 12 ms 3592 KB Output is correct
55 Correct 20 ms 3792 KB Output is correct
56 Correct 70 ms 3676 KB Output is correct
57 Correct 21 ms 3932 KB Output is correct
58 Correct 13 ms 3932 KB Output is correct
59 Correct 98 ms 4024 KB Output is correct
60 Correct 23 ms 4184 KB Output is correct
61 Correct 18 ms 4188 KB Output is correct
62 Correct 93 ms 4236 KB Output is correct
63 Correct 92 ms 4188 KB Output is correct
64 Correct 161 ms 4220 KB Output is correct
65 Correct 128 ms 4216 KB Output is correct
66 Correct 102 ms 4216 KB Output is correct
67 Correct 125 ms 4216 KB Output is correct
68 Correct 42 ms 4184 KB Output is correct
69 Correct 41 ms 4196 KB Output is correct
70 Correct 29 ms 4148 KB Output is correct
71 Correct 35 ms 4184 KB Output is correct
72 Correct 30 ms 4180 KB Output is correct
73 Correct 28 ms 4292 KB Output is correct
74 Correct 50 ms 4188 KB Output is correct
75 Correct 61 ms 4188 KB Output is correct
76 Correct 49 ms 4372 KB Output is correct
77 Correct 78 ms 4184 KB Output is correct
78 Correct 60 ms 4352 KB Output is correct
79 Correct 38 ms 4188 KB Output is correct
80 Correct 48 ms 4352 KB Output is correct
81 Correct 55 ms 4348 KB Output is correct
82 Correct 52 ms 4184 KB Output is correct
83 Correct 62 ms 4152 KB Output is correct
84 Correct 53 ms 4188 KB Output is correct
85 Correct 66 ms 4308 KB Output is correct
86 Correct 60 ms 4312 KB Output is correct
87 Correct 71 ms 4292 KB Output is correct
88 Correct 65 ms 4252 KB Output is correct
89 Correct 75 ms 4252 KB Output is correct
90 Correct 65 ms 4356 KB Output is correct
91 Correct 61 ms 4256 KB Output is correct
92 Correct 68 ms 4184 KB Output is correct